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Physical Activity Measurement in Children Accepting Table Tennis Training
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Comparing different accelerometer cut-points for sedentary time in children.

Claudia Fischer1, Mine Yıldırım, Jo Salmon

  • 1EMGO Institute for Health and Care Research and Dept of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands.

Pediatric Exercise Science
|June 26, 2012
PubMed
Summary

This study found that accelerometer cut-points below 100 counts per minute are most appropriate for accurately measuring sedentary time in children. This helps improve the reliability of activity monitors for pediatric research.

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Area of Science:

  • Pediatric physical activity monitoring
  • Biomedical engineering
  • Childhood obesity research

Background:

  • Actigraph accelerometers are commonly used to assess children's sedentary time.
  • Variability in accelerometer cut-points affects the accuracy of sedentary time measurement.
  • Standardizing cut-points is crucial for reliable data in pediatric studies.

Purpose of the Study:

  • To compare the validity of common accelerometer sedentary cut-points in children.
  • To determine the most appropriate cut-point for identifying sedentary behavior in children aged 5-11 years.
  • To inform standardized protocols for measuring children's sedentary time using accelerometers.

Main Methods:

  • Utilized Actigraph Actitrainer uniaxial accelerometers to measure activity intensity in 29 children (5-11 years).
  • Assessed validity of four cut-points (100, 300, 800, 1100 counts/minute) against a structured protocol.
  • Measured activity during computer games, non-electronic sedentary games, television watching, and outdoor play.

Main Results:

  • Median accelerometer counts during all assessed sedentary behaviors were below 100 counts per minute (cpm).
  • 75th percentile values for sedentary behaviors consistently fell below the 300 cpm cut-point.
  • The <100 cpm cut-point demonstrated the highest appropriateness for classifying sedentary time.

Conclusions:

  • The accelerometer cut-point of <100 cpm is recommended for accurately assessing sedentary time in children.
  • This finding contributes to standardizing methods for objective measurement of physical activity in pediatric populations.
  • Accurate measurement of sedentary time is vital for understanding its impact on child health and development.